package cn.kgc.news.filter;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebFilter(filterName = "LoginFilter",urlPatterns = "")
public class LoginFilter implements Filter {
    public void destroy() {
    }
    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request= (HttpServletRequest) req;
        HttpServletResponse response= (HttpServletResponse) resp;
        Object userName=request.getSession().getAttribute("userName");
        if(userName==""||userName==null){
            response.sendRedirect("/page/login.jsp");
        }else {
            chain.doFilter(req, resp);
        }
    }
    public void init(FilterConfig config) throws ServletException {

    }
}
